Recently my STTNG started to behave strange: I noticed that in the Borg and Final Frontier multiball it happens that the mode suddenly ends (mostly when playing the mode for a longer period) and the regular mission that was active before continues - but with still two balls in play. Shouldn't this happen when only one ball is still in play? I've never heard that these two modes can end without draining all balls except one? It's also weird that the game recognizes the two balls correctly as when losing one the mission continues and only ends when losing the last ball. I do not have any problems with recognizing balls in the trough. Is it possible that any other opto could cause this? I upgraded from LA5 to LX7 but behavior started before this.